<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./node_modules/jquery/dist/jquery.min.js"></script>
</head>

<body>
    <button id='btn'>get</button>
    <!-- 可以直接使用edge打开，不会出现跨域错误 -->
    <script>
        $(function () {
            $('#btn').on('click', function(){
                $.ajax({
                    url:'./data.json',
                    type:'get',
                    dataType:'json',/* 
                    success:function(data){ //原本写法
                        console.log(data)
                    } */
                }).then(function(data){//promise写法
                    console.log(data) 
                })
            })
        });
    </script>
</body>

</html>